1,3 years guaranteed 2,Material:ss304 ,brass or ss nuts, PVC/PE coated 3,DN 12 ... 25 4,Thickness:0.2--0.3mm ss corrugated gas hose high pressure pipe1) Connects firmly,2) Has long performance life ... ~70,9)Corrosion resistant,10)Won't jam gas,11)Hose ripple: dense corrugated circular wave ,12)Thickness of stainless steel ...